BM 3.8sp2 sry071
NW 6.5sp2

I have a couple of web sites that my BM proxy is not allowing access
to. I keep getting 401 errors:

HTTP Error 401.2 - Unauthorized: Access is denied due to server
Internet Information Services (IIS)

The other just comes back with: Error: Access is Denied.

No login prompt. Not anything. This is if I use IE - proxy settings
turned on/off - it doesn't matter.

If I use Firefox, I get prompted for authentication, but it never
allows me in.

If I bypass BM, there is no problem.

I am not sure where to go with this.

Any ideas?